The larva of Erythrodiplax media is described and illustrated based on two exuviae of reared larvae and one final stadium larva collected in Xangri-lá, State of Rio Grande do Sul, Brazil. The larva of E. media can be distinguished from other species of Erythrodiplax by the presence of lateral spines on S8 and S9, the number of premental setae (n = 22), palpal setae (n = 7) and by the mandibular formula. We also provide a preliminary key to known South American larvae in the genus. © 2018 Worldwide Dragonfly Association.
This research was supported by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) through a postdoctoral fellowship (to MSD) and a Professor Visitante do Exterior (PVE) cooperation program between UNIVATES and Halmstad University [88881.068147/2014-01 #1] and by FAPERGS (Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, [PROBIC/2016, #2]).